Johnny Got His Gun is a 1971 American independent anti-war film written and directed by Dalton Trumbo. Based on his own novel of the same name, it was Trumbo's first and only directorial effort. The film stars Timothy Bottoms, Kathy Fields, Marsha Hunt, Jason Robards, Donald Sutherland, and Diane Varsi.

Although it was a minor success upon its initial release, the film was largely forgotten by the mass audience soon after. It received renewed attention in the late 1980s after clips from it were incorporated into the popular music video for Metallica's single "One", and the film has subsequently become a cult film. Eventually, Metallica bought the rights to the film in order to be able to show the music video without having to keep paying royalties.